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GL 212 Two-Stage Epicyclic Gear Apparatus
Education / GUNT Hamburg / Engineering Mechanics and Machine Elements / Fundamentals of Engineering Design /

GL 212 consists of 2 identical epicyclic gear stages with 3 planet wheels each. They are coupled in a way that the ring gear of the first stage is connected to the planet carrier of the second stage. Up to 4 different transmission ratios can be realised by blocking single wheels. The gears are driven using a cable drum and a variable set of weights that are lifted using a removable crank.
  Unwinding is prevented by a detent pawl. To determine effective torque, the deflection of a bending beam is used to measure forces. The speeds of the stages are measured by inductive sensors and can be recorded as speed-time diagram using a chart recorder. Effective moments of inertia are determined via angular acceleration. A transparent safety cover prevents unintentional contact with rotating parts.

Learning Objectives / Experiments
- Determination of transmission ratios at blocked 
- Determination of transmitted forces at blocked gear 
- Gear acceleration at constant driving torque 
- Influence of transmission ratio 
- Determination of reduced moment of inertia
- Conversion of potential into kinetic energy 
- Determination of friction
- Gear efficiency

[1] Study of dynamic behaviour of a two-stage epicyclic gear
[2] 4 different gear transmissions possible 
[3] Drive via cable drum with free-wheel, unwinding prevented by a detent pawl
[4] Drive weight 5...50kg
[5] Holder (container) with a shock absorbing inlet to collect the drive weight 
[6] Inductive speed sensors 
[7] Force measurement via bending beam
[8] Chart recorder for speed-time diagrams
[9] Transparent plastic safety cover

Technical Data


- modulus: 2

- sun wheels, planet wheels: z=24, d-reference 
  circle: 48mm

- ring gears: z=72, d-reference circle: 144mm

- cable drum with free-wheel and weights

- max. potential energy stored: 245.3Nm
Load at stand still

- weight for torque measurement at bending beam:

Dial gauges: accuracy 0.02mm
Chart recorder

- chart width: 100mm

- paper feed: 7200mm/h

Speed range: 0...2000rpm


Dimensions and Weight
l x w x h: 1000 x 650 x 1700 mm
Weight: approx. 150 kg
Required for Operation
230V, 50Hz, 1 phase
Scope of Delivery
1 apparatus, complete
1 instruction manual
Order Details

030.21200  GL 212  Two-Stage Epicyclic Gear Apparatus